ios – 是否有一个手势识别器可以同时处理捏和平移？

不要忘记遵守UIGestureRecognizerDelegate协议

如果你无法同时获得捏和平移,也许是因为你错过了这种方法：

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

这是完整的源代码：

#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view,typically from a nib.

    isEdiTing = false;

    photoView = [[UIImageView alloc] initWithFrame:CGRectMake(0,320,460)];
    [photoView setImage:[UIImage imagenamed:@"photo.png"]];
    photoView.hidden = YES;

    maskView = [[UIImageView alloc] initWithFrame:CGRectMake(0,460)];
    [maskView setImage:[UIImage imagenamed:@"maskguide.png"]];
    maskView.hidden = YES;

    displayImage = [[UIImageView alloc] initWithFrame:CGRectMake(0,460)];

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@SELEctor(handlePan:)];
    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@SELEctor(handlePinch:)];

    [panGesture setDelegate:self];
    [pinchGesture setDelegate:self];

    [photoView addGestureRecognizer:panGesture];
    [photoView addGestureRecognizer:pinchGesture];
    [photoView setUserInteractionEnabled:YES];

    [panGesture release];
    [pinchGesture release];

    btnEdit = [[UIButton alloc] initWithFrame:CGRectMake(60,400,200,50)];
    [btnEdit setBACkgroundColor:[UIColor blackColor]];
    [btnEdit settitle:@"Start EdiTing" forState:UIControlStateNormal];
    [btnEdit addTarget:self action:@SELEctor(toggleEdiTing) forControlEvents:UIControlEventTouchUpInside];

    [[self view] addSubview:displayImage];
    [[self view] addSubview:photoView];
    [[self view] addSubview:maskView];
    [[self view] addSubview:btnEdit];

    [self updateMaskedImage];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPorTraitUpsideDown);
}

-(void)dealloc
{
    [btnEdit release];

    [super dealloc];
}

#pragma mark -
#pragma mark update Masked Image Method
#pragma mark -

-(void)updateMaskedImage
{
    maskView.hidden = YES;

    UIImage *finalImage = 
    [self maskImage:[self captureView:self.view]
           withMask:[UIImage imagenamed:@"mask.png"]];


    maskView.hidden = NO;

    //UIImage *finalImage = [self maskImage:photoView.image withMask:[UIImage imagenamed:@"mask.png"]];

    [displayImage setImage:finalImage];
}

- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {

    CGImageRef maskRef = maskImage.CGImage; 

    CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),CGImageGetHeight(maskRef),CGImageGetBitsPerComponent(maskRef),CGImageGetBitsPerPixel(maskRef),CGImageGetBytesPerRow(maskRef),CGImageGetDataProvider(maskRef),NULL,falsE);

    CGImageRef masked = CGImageCreateWithMask([image CGImage],mask);
    return [UIImage imageWithCGImage:masked];

}

#pragma mark -
#pragma mark Touches Began
#pragma mark -

// adjusts the ediTing flag to make dragging and drop work
-(void)toggleEdiTing
{
    if(!isEdiTing)
    {
        isEdiTing = true;

        NSLog(@"ediTing...");

        [btnEdit settitle:@"Stop EdiTing" forState:UIControlStateNormal];

        displayImage.hidden = YES;
        photoView.hidden = NO;
        maskView.hidden = NO;
    }
    else
    {
        isEdiTing = false;

        [self updateMaskedImage];

        NSLog(@"stopped editTing");

        [btnEdit settitle:@"Start EdiTing" forState:UIControlStateNormal];

        displayImage.hidden = NO;
        photoView.hidden = YES;
        maskView.hidden = YES;
    }
}

/*
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{   
    if(isEdiTing)
    {
        UITouch *finger = [touches anyObject];
        CGPoint currentPosition = [finger LOCATIOnInView:self.view];

        //[maskView setCenter:currentPosition];
        //[photoView setCenter:currentPosition];
        if([touches count] == 1)
        {
            [photoView setCenter:currentPosition];
        }
        else if([touches count] == 2)
        {

        }
    }
}
*/

-(void)handlePan:(UIPanGestureRecognizer *)recognizer
{    
    CGPoint translation = [recognizer translationInView:self.view];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,recognizer.view.center.y + translation.y);
    [recognizer setTranslation:CGPointMake(0,0) inView:self.view];
}

-(void)handlePinch:(UIPinchGestureRecognizer *)recognizer
{    
    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform,recognizer.scale,recognizer.scalE);
    recognizer.scale = 1;
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

#pragma mark -
#pragma mark Capture Screen Function
#pragma mark -

- (UIImage*)captureView:(UIView *)yourView 
{
    UIGraphicsBeginImageContextWithOptions(yourView.bounds.size,yourView.opaque,0.0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [yourView.layer renderInContext:context];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

#pragma mark -

@end